For #1 I meant to put (a-4)(a-4)
Sorry I meant (a-4)(a+4)
#3, I see a common factor
3ab(a + 2 + 3b)
#5 common factor
z(z^2 + 6z + 9), now I see a perfect square
8 times 8 is 64, not 16
4 times 4 is 16
3ab (a + 2 + 3b)
z (z^2 + 6 z + 9)
neither of your corrections for #1 gives you back the original result if expanded.
a^2-16b does not factor, unless you meant
a^2-16b^2, then it would be (a+4b)(a-4b)
I did not see that b there !
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